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Calculation of elastic anisotropy using EMATs validated by EBSD in rolled aluminium sheet
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Essex, S. D., Potter, M. D. G. and Dixon, S. (2009) Calculation of elastic anisotropy using EMATs validated by EBSD in rolled aluminium sheet. AIP Conference Proceedings (No.1096). pp. 1727-1734. doi:10.1063/1.3114167 ISSN 0094-243X.
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Official URL: http://dx.doi.org/10.1063/1.3114167
Abstract
Determining the Orientation Distribution Function (ODF) accurately and quickly in a non-destructive manner has many benefits and applications within industry. The ODF is essentially a quantitative description of the existence of anisotropy, or texture, within a metal sheet. The anisotropy can be seen experimentally by the variation in Lamb wave velocities in the plane of the sheet as a function of angle to the Rolling Direction. The anisotropy can be quantitatively described by the Orientation Distribution Coefficients (ODCs) W-400, W-420 and W-440. Electron Backscatter Diffraction (EBSD) is a technique performed in a SEM. It infers the crystallographic directions of crystals near-surface, and can be applied to a number of samples. It enables the accurate quantitative and qualitative description of microstructural properties such as grain size. By manipulating the Bunge-Euler angle data given by the EBSD technique, here we describe a method to extrapolate the effective elastic constants for Aluminium sheet, and go on to generate a method to predict a Lamb wave velocity profile as a function of angle in a directly comparable format to that measured using a commercially available EMAT-EMAT S-0 Lamb wave velocity measurement system. Results show a very good correlation between the predicted velocity trace from EBSD compared to that measured ultrasonically, and hence the respective ODCs, except in the cases where surface to bulk texture inhomogeneity exist.
| Item Type: | Journal Article | ||||
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| Subjects: | Q Science > QC Physics | ||||
| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering Faculty of Science, Engineering and Medicine > Science > Physics |
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| Library of Congress Subject Headings (LCSH): | Electromagnets, Electrons -- Backscattering, Electrons -- Diffraction, Aluminium, Texture (Crystallography), Anisotropy | ||||
| Journal or Publication Title: | AIP Conference Proceedings | ||||
| Publisher: | American Institute of Physics | ||||
| ISBN: | 978-0-7354-0629-2 | ||||
| ISSN: | 0094-243X | ||||
| Editor: | Thompson, DO and Chimenti, DE | ||||
| Official Date: | 2009 | ||||
| Dates: |
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| Number: | No.1096 | ||||
| Number of Pages: | 8 | ||||
| Page Range: | pp. 1727-1734 | ||||
| DOI: | 10.1063/1.3114167 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Description: | Conference proceedings of 35th Annual Review of Progress in Quantitative Nondestructive Evaluation, University of Chicago, Chicago, IL, 20-25 Jul 2008 |
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| Conference Paper Type: | Paper | ||||
| Type of Event: | Conference |
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